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An absolute photometric system at 10 and 20 micronsTwo new direct calibrations at 10 and 20 microns are presented in which terrestrial flux standards are referred to infrared standard stars. These measurements give both good agreement and higher accuracy when compared with previous direct calibrations. As a result, the absolute calibrations at 10 and 20 microns have now been determined with accuracies of 3 and 8 percent, respectively. A variety of absolute calibrations based on extrapolation of stellar spectra from the visible to 10 microns are reviewed. Current atmospheric models of A-type stars underestimate their fluxes by about 10 percent at 10 microns, whereas models of solar-type stars agree well with the direct calibrations. The calibration at 20 microns can probably be determined to about 5 percent by extrapolation from the more accurate result at 10 microns. The photometric system at 10 and 20 microns is updated to reflect the new absolute calibration, to base its zero point directly on the colors of A0 stars, and to improve the accuracy in the comparison of the standard stars.
Document ID
19850050123
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Rieke, G. H.
(Arizona Univ. Tucson, AZ, United States)
Lebofsky, M. J.
(Arizona Univ. Tucson, AZ, United States)
Low, F. J.
(Steward Observatory Tucson, AZ, United States)
Date Acquired
August 12, 2013
Publication Date
May 1, 1985
Publication Information
Publication: Astronomical Journal
Volume: 90
ISSN: 0004-6256
Subject Category
Astronomy
Accession Number
85A32274
Distribution Limits
Public
Copyright
Other

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